A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. Bearings are “parts that assist objects’ rotation”. They support the shaft that rotates inside the machinery. Machines that use bearings include automobiles, airplanes, electric generators and so on. Journal bearing – Simplest type of bearing, comprising just a bearing surface and no rolling elements. Hinge – Mechanical bearing connecting two objects. Main bearing. Needle roller bearing – Type of roller bearing which uses long, thin cylinders as rollers.
Nowadays, bearings are one of the most commonly used machine parts because their rolling motion make almost all movements easier and they help reduce friction. Bearings have two key functions: They transfer motion, i.e. they support and guide components which turn relative to one another. They transmit forces. The main purpose of bearings is to prevent direct metal to metal contact between two elements that are in relative motion.
This prevents friction, heat generation and ultimately, the wear and tear of parts. It also reduces energy consumption as sliding motion is replaced with low friction rolling. In mathematics, a bearing is defined as an angle measured clockwise from north. Bearings are usually written as a three-figure bearing. For example, the angle 50° from north is written as 050°. A bearing is always defined as an angle clockwise from north.
